v3.19.3
ACQUIRED INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
ACQUIRED INTANGIBLE ASSETS ACQUIRED INTANGIBLE ASSETS    

During the three and nine months ended September 30, 2019, the Company did not make any material acquisitions.
    
The following table presents the detail of acquired intangible assets as of the periods presented (in thousands):
 
Balance at September 30, 2019
Cost
 
Accumulated Amortization
 
Net
Technology assets
54,630

 
(30,682
)
 
23,948

Customer assets
44,045

 
(6,089
)
 
37,956

Trade name
11,300

 
(3,767
)
 
7,533

Other
5,299

 
(1,943
)
 
3,356

Total
$
115,274

 
$
(42,481
)
 
$
72,793


 
Balance at December 31, 2018
Cost
 
Accumulated Amortization
 
Net
Technology assets
$
45,978

 
$
(28,420
)
 
$
17,558

Customer assets
57,109

 
(8,068
)
 
49,041

Trade name
11,300

 
(1,648
)
 
9,652

Other
2,246

 
(1,395
)
 
851

Total
$
116,633

 
$
(39,531
)
 
$
77,102



All intangible assets are amortized over their estimated useful lives. The weighted average amortization periods for acquired technology, customer intangible assets, and acquired trade name are approximately 5 years, 12 years and 4 years, respectively.

The changes to the carrying value of intangible assets were as follows (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Acquired intangible assets, net, beginning of the period
$
84,216

 
$
85,514

 
$
77,102

 
$
14,334

Acquisitions
—

 
—

 
14,559

 
75,871

Amortization expense
(3,841
)
 
(4,384
)
 
(11,286
)
 
(9,075
)
Transfer to assets held for sale (Note 8)
(7,582
)
 
—

 
(7,582
)
 
—

Acquired intangible assets, net, end of the period
$
72,793

 
$
81,130

 
$
72,793

 
$
81,130



The total estimated future amortization expense of these intangible assets as of September 30, 2019 is as follows (in thousands):
2019 (remaining 3 months)
$
3,714

2020
12,800

2021
11,829

2022
10,134

2023
8,917

Thereafter
25,399

Total
$
72,793